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make sure you acclimate them properly because they are from different water conditions. I think for a day or two you might experience some aggression so move them as soon as you can. Watch the other fish very carefully. FYI dwarf rainbows need a bigger school

I always drip acclimate my fish regardless of what they are or where they are from.
In regards to the rainbowfish im aware they need to be 5 or more. I did have 6 but i lost 4 soon after purchase due to bad stock. The fish stores here havent had any in stock since then so thats why i only have the 2 still.

OK aside from acclimating and such.. These fish will be VERY aggressive when they get older(especially against community fish) and your new tank will need to be cycled which will make the process take another 20 -30 days. 50 days is enough time for mbuna fry(when properly cared for) to put on another inch- inch and a half or more. I recommend you get a 55g or 75g as the new tank, as auratus get fairly large(you could also add more mbuna into the new tank if you wish). Also, what you will need to do so that you can safely stock the tank ASAP would be to buy one of your filters for the new tank now( I recommend either 2 Aquaclear 70s for a 55 or 2 aquaclear 110s for a 75). Hook the new filter up to your community tank and allow that filter to cycle the media. Aside from this all you can do is do frequent water changes to keep stress down and keep an eye on them. As stated, you might not see territorial issues but mbuna fry will nip and "play" CONSTANTLY. They are very active fish if they're healthy and you might notice some issues with the smaller or more docile fish in your tank.